A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Bhardwaj, B. D.
- Channel Sand Bodies in Middle Siwalik Sediments in Jamrani Area, Nainital District, U.P.
Authors
1 Department of Geology, Aligarh Muslim University, Aligarh, IN
2 Mineral Exploration Circle, Patwadi Gate, Bhuj-Kachchh-370 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 24, No 4 (1983), Pagination: 215-218Abstract
Eight river channel sand bodies are recorded and studied in the upper part of the Middle Siwalik group in Jamrani area. These sand bodies are characteristically lens shaped in cross-sectional view and exhibit fining upward sequence. Their shape, internal characters and orientation in space and time indicate that these sand bodies were formed due to scouring and filling by migrating streams.Full Text
- Upper Bhander Sandstone: An Example of Barrier Beach Deposits from Tantpur area, District Agra, Uttar Pradesh, India
Authors
1 Department of Geology, Aligarh Muslim University, Aligarh 202001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 34, No 1 (1989), Pagination: 67-75Abstract
The Upper Bhander Sandstone occurring in the Tantpur area consists of red, brown and dirty white orthoquartzite with intercalations of shales. The sandstone is texturally and mineralogically mature. The palaeocurrent pattern worked out with the help of primary sedimentary structures reveals that the direction of the sediment transport remained north-westerly. The coarsening upward of the sequence, sedimentary structures, elongated sand bodies and polymodal palaeocurrent pattern indicate that Upper Bhander sandstone sequence of the Tantpur area was deposited on a beach complex in a regressive shoreface environment.
- Sedimentology of a Recent Alluvial Fan of Ganga River, Rishikesh, India
Authors
1 Department of Geology, Aligarh Muslim University, Aligarh-202 002, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 39, No 6 (1992), Pagination: 457-465Abstract
The annual flow of the river Ganga is 468.7 billion cubic meters. The river emerges on the plain at Rishikesh from the mountains. The Alluvial fan deposits are divided into three facies: proximal, medial and distal fan facies. The nature of sediments varies from coarse gravel and boulders to fine gravel to coarse sand. The proximal facies show massive units (Gms) and coarsening upward of sediments. The gravel and boulders of proximal facies are randomly oriented and are poorly sorted, which are described as debris deposits. The sediments of mid fan facies show massive units (Gms), horizontal stratification (Gh) and planar cross-stratification (Gp). The sediments are moderately sorted and show imbrication. Distal fan Sediments are well sorted marked with trough cross-stratification (St) and gravelly channel deposits (Gs). The sediments of mid fan and distal fan facies show fining upward sequence and are described as water-laid deposits. The distal fan deposits show transitional relationship with the braided river deposits.Keywords
Alluvial Fan, Ganga River, Rishikesh, Sedimentology.- Petrography and Environmental Significance of Bhander Limestone (Upper Vindhyan) in Kota-Rawatbhata Area, Rajasthan
Authors
1 Department of Geology, Aligarh Muslim University, Aligarh, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 14, No 1 (1973), Pagination: 89-95Abstract
Field and petrographic characters of the Bhander limestone in the Kota-Rawatbhata area, Rajasthan, permit its division into three lithofacies: (1) interlaminated calcilutite-calcisiltite, (2) flat-pebble calcirudite breccia, and (3) flat-bedded limestone. The predominant red colour, microcrystalline texture, large quantity of insoluble clay residue, and presence of algal stromatolites in lithofacies (1) and (2) suggest their deposition in the supratidal environment. Lithofacies (3) is predominantly micritic, characterised by flat and continuous bedding and marked by the presence of stromatolites, and is interpreted as a product of sedimentation on a vast, shallow submerged shelf where wave energy was cut off by the extensiveness of the shelf.- Barrier Inlet and Associated Facies of Shore Zone: An Example from Khardeola Formation of Lower Vindhyan Sequence in Chittaurgarh, Rajasthan
Authors
1 Department of Geology, Aligarh Muslim University, Aligarh - 202 002, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 58, No 2 (2001), Pagination: 97-111Abstract
Khardeola Formation (∼200 m), representing the lowermost clastic assemblage of Vindhyan Supergroup in southeast Rajasthan, consists of a fine clastic sequence in the lower part and a gritty, coarse to medium grained sandstone in the upper part. The formation crops out as discontinuous linear patches close to the western boundary of the basin. The Khardeola assemblage is investigated in this study for sedimentary facies, palaeocurrents, depositional environments and palaeogeography at the onset of Vindhyan sedimentation.
The lower fine clastic sequence (15-60 m thick) consists of interlaminated shale and siltstone, thinly bedded sandstone and mudstone,and red sandstone in a coarsening upward sequence, showing parallel to wavy lamination, ripple marks, desiccation cracks, bidirectional cross lamination, and gently inclined lamination. The facies assemblage, their characteristics, and occurrence alongside linear bodies of Khardeola sandstone, call for a protected depositional environment (back barrier lagoonal to tidal flat). The succeeding Khardeola sandstone, forming the upper part of the assemblage, represents 40-150 m thick sequence of moderately well sorted quartzarenite, subarkose and sublitharenite, and crops out as narrow linear ridges trending north-South. These sandstone units are divisible into four facies on the basis of fining upward texture, bedding types, and scale of sedimentary structures. Conglomeratic facies occurs in the basal part of sandstone with well defined scour base. The succeeding facies of lenticular sandstone with scour base comprises upward thinning sets of large, medium and small scale planar and trough cross bedding. The paleocurrent pattern reflects bipolar, bimodal to trimodal dispersal from the base of the sequence upward, directed broadly towards east and west, and occasionally towards north or south. Inasmuch as the source area providing quartzo feldspathic sediments was located mainly to the west of study area, the easterly paleocurrents were directed basinward (seaward). These deposits are interpreted as originating within laterally migrating tidal inlets (barrier inlets), in which easterly oriented ebb currents were dominant, with intermittent influx of flood oriented and north or south directed longshore currents. Plane bedded to gently inclined units of quartzarenite are interpreted as beach foreshore (spit) deposits that occur in places, capping the barrier inlet sequence. A combination of barrier inlet migration and shoreline transgression resulted in a truncated and modified barrier island sequence, dominated by inlet fill sandstone that merges with or oversteps westward (landward) the interlayered, fine grained clastic lagoonal/Tidal flat facies.
The Khardeola sedimentation was terminated with the decline in sediment supply, rise in sea level and landward migration of shoreline, followed by deposition of the overlying algae dominated Bhagwanpura Limestone in a quiet,open shelf of transgressive phase.